Calcium stearate coated

Lin, Y. Chen, H., Chan, C.M. Wu, J. (2011). Nucleating effect of calcium stearate coated CaC03 nanoparticles on polypropylene. Journal of Colloid and Interface Science, Vol. 354, pp. (570-576)... 

Synthetic hydrotalcites employed in plastics applications are finely divided, free-flotving, odorless, amorphous powders. For polyolefin applications, hydrotalcites with an average particle size of 0.5 (tm and a specific surface area ofless than 20 m /g (BETmethod) are recommended. Their density varies around 2.1 g/cm depending on the composition. Sodium, zinc, and calcium stearate-coated hydrotalcites are available, which show enhanced compatibility with polyolefins [13]. Figure 20.3 is a scanning electron micrograph of a typical submicron-size synthetic hydrotalcite [20]. 

Coated with polycaprolactone calcium stearate Coated with polycaprolactone calcium stearate Coated by magnesium stearate... 

Gama-Sperse CS-11, Finely ground calcium stearate-coated product, Georgia Marble Co. 

The adsorption of gas onto a solid surface can also be used to estimate surface energy. Both inverse gas chromatography (IGC) and isotherm measurement using the BET method [19] have been used. Further discussion and detailed references are given by Lucic et al. [20] who compare the application of IGC, BET and contact angle methods for characterising the surface energies of stearate-coated calcium carbonate fillers. 

Typical additive packages for engineering thermoplastics have been described by Titzschkau [9], such as processing aids for PA, PP, or PET/PBT, three-component additive packages for polyamides and polyesters (nucleating agent, lubricant and process heat stabiliser) and coated copper stabilisers for polyamides. Additive packages or combinations of up to five or more additives are quite common. A typical white window PVC profile formulation comprises an acrylic impact modifier, TiC>2, CaCC>3, calcium stearate, a... 

Calcium carbonate is the most commonly used extender. It is widely available and low in cost, and it provides for improvements in certain performance properties. The material is a mineral that is mined throughout the world. Common forms of calcium carbonate include limestone, marble, calcite, chalk, and dolomite. It is manufactured by precipitation processes and is commercially available from a number of sources. Calcium carbonate is available in many different particle sizes and in various grades. To improve dispersion in certain resins, the filler is often coated with calcium stearate or stearic acid. 

The primary particle size of Winnofil stearate coated precipitated calcium carbonate from Zeneca Resins is in the region of 0.075 micron. When compounded into natural and synthetic elastomers, the hydrophobic surface coating assists wetting and aids dispersion. When compounded into plasticised PVC for cable sheathing, the PCC allows for formulations with minimal potential for acid gas release in combustion conditions. In rigid PVC, stearate coated PCC has been used in compounding as an alternative to conventional acrylic processing aids and as a means to reduce impact modifier levels. 

According to 3 (Vol. 2)] in Sweden a temperature of 75 C is maintained during the reaction, and du Pont Co. introduced 0.25% calcium stearate as an agent for coating the dextrinated particles. According to [1] the hygroscopicity of dextrinated lead azide can be higher than 0.5%. 

Fine Calcium Carbonates 8102, 8103, 8105, 8107 exceptionally pure calcium carbonates of different particle sizes. Also grades are manufactured with the same number symbol followed by letter C which stands for stearate coated grade... 

Ultrafine Calcium Carbonates 8.14, 8101 particle size 0.2-1.4 pm produced with (C) and without stearate coating... 

Figure 8.32 shows the effect of filler type and concentration on the mode of fracture. Several factors are responsible for the behavior. CaT (calcium terephthalate) fillers have good adhesion to the matrix and have an elongated shape. CaCOs (1) and (2) are both untreated fillers of smaller particle sizes (2.2 and 4.1 (dm, respectively). CaCO (3) is a stearate coated filler (better dispersion, but poor adhesion to matrix) with a particle size of 6.1 im. The mode of fracture depends on filler concentration, the degree of adhesion to the matrix, and particle size. 

Ch er the years numerous proprietary modifications have been made by private industry in order to improve the flow, pressing, and general handling and safety characteristics of dextrinated material. Figure 1 Id. for example, is a micrograph of a product known as Elcoat, manufactured by the duPont Company, which has 0.25% calcium stearate added as a coating to the dextrinated particles to decrease the sensitivity and improve the compactability of the powders. 

One interesting approach to the loss of volatile liquids is the use of an evaporation suppressant for the styrene used to cure unsaturated polyester resins.181 The suppressant, made from a bisphenol A epoxy resin, stearic acid, colophony, triethanolamine, glycerol monostearate, calcium stearate, and sorbitan monostearate, may coat the surface to retard evaporation. 

Drelich, J. and Field, K.G. (2007) Formation of biomimetic porous calcium phosphate coatings on surfaces of polyethylene/zinc stearate blends. Materials Science and Technology (MS T), September 16-20, 2007, Detroit, MI, p. 187. 

Cakium Stearate Regular. [Witco] Calcium stearate lubricant for ceramics, foundry sands, plastics plasticizer/lu-bricant for paper coatings aux. emulsifier. 

Nopcote. Henkel-N( )Co] Calcium stearate lubricant for paper coatings. 

WfamofiL pClResins] Precipitated stearate-coat calcium carbonate filler, impact modifier, processing aid for theinKq>lastics and pauns. 

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